XXVI. ROSA‘CEH: PU’RSHIA. 297 
20 ft. to 30ft. Introduced in 1759. Flowers white; May. Drupe dark 
purple ; ripe ?. 
This tree Michaux considers as one of the most beautiful vegetable pro- 
ductions of the southern parts of the United States; and it is generally se- 
lected by the inhabitants to plant near their houses, not only on this account, 
but because it grows with rapidity, and affords an impenetrable shade. Pursh 
describes it as a handsome evergreen shrub, resembling C. lusitanica ; but he 
says nothing of the flowers, which, from the figure in Michaux, from which 
ours was copied, appear to be almost without petals. Seeds are frequently 
imported from America, and abundance of young plants reared; but, as they 
are rather tender, and, north of London, would require the protection of a 
wall, they are very seldom seen in British gardens. The largest plant which 
we know of is in Hampshire, at Swallowfield, where, in 1833, it formed a 
bush 10 ft. high, with a head about 12 ft. in diameter, flowering and fruiting 
occasionally. Culture as in C. virginiana, but north of London it requires the 
protection of a wall. 
Sect. II]. Spirnme‘m. 
Genus VI. 
PU’RSHIA Dec. Tus Pursutia. Lin. Syst. Icosndria Monogynia. 
Identification. Dec. in Trans. of Linn. Soc., 12. p.157.; Prod.,2 p.541.; Lindl. in Bot. Reg. 
t. 1446.; Don’s Mill., me 517. 
Synonyme. Tigarea Ph. Fl. Amer. Sept., 1. p. 333., not of Aublet. 
Derivation. Frederick Pursh first characterised the only known species in his Flora America, 
Septentrionalis, and named it Tigarea tridentata. The generic name, however, having been 
preoccupied by Aublet, De Candolle has named the present genus after Pursh himself. 
Gen. Char. Calyx 5-cleft; lobes ovate, obtuse. Petals 5, obovate. Stamens 
about 25, rising with the petals from the calyx. Carpels 1—2, ovate oblong, 
pubescent, tapering into the style at the apex, at length opening by a lon- 
gitudinal chink. Seed 1, inserted in the base of the carpel. (Don’s Mill.) 
Leaves simple, grouped together, cuneate, 2—3-toothed at the apex, 
stipulate or exstipulate, deciduous. Flowers yellow. — Shrub, of which 
there is only one species known. 
#1, P. rripenta‘ra Dec. The 3-toothed-leaved Purshia. 
Identification. Dec. in Lin. Trans., 12. p. 157. ; Prod., 2. p. 541. 
Synonyme. Tigdarea tridentata Ph. Fl. Amer. Sept., 1. p. 333. t, 15., not of Aublet. 
Engravings. Ph. Fl. Amer. Sept., t.15.; Bot. Reg., t. 1446. ; and our figs. 487, 488. 
Spec. Char., §&c. Leaves obcuneate, 3- 
dentate, crowded on the points of the 
shoots, hairy above, and tomentose 
beneath. Flowers terminal on short 
peduncles. (Ph. Fl. Amer.) A spreading 
shrub. North America, on pastures 
by the river Columbia. Height 2 ft. to 
3 ft. Introduced in 1826. Flowers 
_yellow; July. Carpels ?. 
pal aie Almost the only shrub to be seen 4g, P. tridentata 
through an immense tract of barren sandy 
soil, from the head source of the Missouri, to the Falls of the Columbia. The 
plants in the London gardens were all killed in the winter of 1837-8. 
